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Has anyone successfully installed Nest hotwater function to 30cdi classic boiler?

Discussion in 'Plumbing and Central Heating' started by Andrew Staines, 21 Sep 2020.

  1. Andrew Staines

    Andrew Staines

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    Perfect, many thanks to you all
     
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  3. Andrew Staines

    Andrew Staines

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    Hi Picasso, or anyone else who would like to advise,

    Just one more follow up query. Whilst looking into replacing the tank temperature sensor with a thermostat I've noticed that I don't have a high limit thermostat. Does a vented tank require one?
     
  4. picasso

    picasso

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    No you only need the stat or the sensor.
     
  5. Andrew Staines

    Andrew Staines

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    Great stuff. Thanks again.
     
  6. Andrew Staines

    Andrew Staines

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    Good afternoon.

    Just to clarify before this happens, is the attached diagram correct for the set up discussed earlier this week?

    upload_2020-9-25_14-3-27.png

    Please advise if it's not.
     
  7. Andrew Staines

    Andrew Staines

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    Or is it more like this?
    upload_2020-9-25_15-25-17.png
     
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  9. picasso

    picasso

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    First one is bang on.
     
  10. Andrew Staines

    Andrew Staines

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    Thanks again Picasso, top man! When it's done I will post the result for the benefit of others with the same query in future.
     
  11. Andrew Staines

    Andrew Staines

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    Update - so in conclusion, yes; you can successfully install a Nest hot-water function to 30cdi classic boiler as well as central heating function!

    In brief this is how we did it. (**disclaimer** The following should be performed by a qualified engineer and all power to the system must be isolated!)

    First the temperature sensor on the hot water tank was replaced with a thermostat, followed by a factory reset on the boiler so that it would reconfigure itself to use the stat.

    Next, the central heating thermostat was disconnected from the boiler terminals and the Nest heat link was installed and connected to the attached diagram (with the hot water tank thermostat wired in series to the heatlink);

    [​IMG]

    Nest fired up and all updates installed. Boiler switched on and all worked as expected.
     
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  12. Brownjamesa

    Brownjamesa

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    Hi Andrew,

    I have the exact same boiler as you and I belive I also have a temperature sensor on the hot water tank.

    Could you please share the thermostat you used to replace it?

    Cheers
    James
     

    Attached Files:

  13. Andrew Staines

    Andrew Staines

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    Hi James

    upload_2020-11-20_14-40-45.png
    This one, you can get these almost anywhere. Worked perfectly for me.
    Andrew
     
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